ffmpeg:连续编码base64数据块并将其附加到输出文件中

import subprocess
import base64

def encode_base64_chunk(chunk):
    return base64.b64encode(chunk).decode('utf-8')

def encode_video_to_base64(input_file, output_file):
    # 使用 FFmpeg 读取视频帧并转换为 PNG 格式
    process = subprocess.Popen(['ffmpeg', '-i', input_file, '-vf', 'fps=1', 'frames/%04d.png'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    
    with open(output_file, 'w') as f:
        frame_count = 0
        while True:
            line = process.stdout.readline()
            if not line:
                break
            frame_count += 1
            # 读取每一帧并编码为 Base64
            frame_data = subprocess.check_output(['convert', f'frames/{frame_count:04d}.png', '-'], stderr=subprocess.STDOUT)
            base64_data = encode_base64_chunk(frame_data)
            f.write(base64_data + '\n')
    
    process.wait()

# 示例调用
encode_video_to_base64('input.mp4', 'output.txt')